Device for protecting the exhausting socket of vacuum glass vessels containing mercury



Oct. 7, 1930. E. SCHOTT 1,777,361

DEVICE FOR PROTECTING THE EXHAUSTING SOCKET OF VACUUM GLASS VESSELSCONTAINING MERCURY Filed July 20,- 1927 Jn ventar:

Patented Oct. 7, 1930 UNITED STATES- IERICH SGHOTT, F

JENA, GERMANY; ASSIGNOR TO THE FIRE: J'ENAER GLASWEBK SCHOT'I. & GEN.,01 L'I'ENA, GERMANY DEVICE FOR PROTECTING THE EXHA USTING SOCKET 0FVACUUMI GLASS VESSELS CON- TAINING- MERCURY Application filed July 20,1927, Serial no.

In vacuum glass vessels in order to avoid the mercury contained thereininjuring the exhausting socket due to sudden changes of the position ofthe vessel, it has been suggested to dispose in the socket a body bywhich the opening of the socket is for the most part closed. Accordingto the present invention a particularly simplified and at the same timevery effective construction for such a device consists in the use of astopper which penetrates from the socket into a constriction, lyingbetween the vessel and the socket, and fills it up as tightly aspossible. It is not necessary, however, to attain perfect tightness (e.g. by grinding in) but it suflices' if the stopper -tits approximately.It has proved of particular advantage to impartto the stopper such alength that it projects into the glass vessel.

The annexed drawing shows an example of the invention. v

The glass Vessel is denoted by a, the exhausting socket by b. Acylindrical stopper 0 fits with only slight play into the constriction71 of the socket. The drawingshows the' point d of the socket in a fusedstate, corresponding to a glass vessel ready for use. When evacuatingthe vessel the point is still open, and the socket is being connected toan air pump. When evacuating the air is not prevented by the stopper torush by the latter and escape from the vessel. However, when in use themercury cannot pass by the stopper and cause damage to the socket, sincethe surface tension of the mercury prevents it from rushing past it. Ahead 0 prevents the stopper from falling out of the socket.

I claim:

1. In a glass vessel to be evacuated a socket for the evacuation of thevessel, the socket having a constriction, and a cylindricalstopperprojecting from the said socket into the constriction, having athickness corresponding tothe width of the constriction and beingmovable therein.

2. In a glass vessel to be evacuated a socket for the evacuation; of thevessel, the socket having a constriction, and a cylindrical stopperprojecting from the said socket through the-constriction into the glassvessel, having 207,245, and in Germany August 2, 1926.

tion. v

ERICH SCHOTT.

